充气谷歌地图V2片段引起的ClassNotFoundException [英] Inflating Google Maps v2 fragment causes ClassNotFoundException
问题描述
对不起,我张贴在这个问题上。
我曾经所指向这么多的链接。
但依然没能解决这一问题。
- 我已经联系了谷歌播放-services_lib服务。
- 的属性设置为谷歌公司。
- 获取从谷歌控制台API_KEY。
这是我的Manifest.xml:
<?XML版本=1.0编码=UTF-8&GT?;
<清单的xmlns:机器人=http://schemas.android.com/apk/res/android
包=com.abc.xyz
安卓版code =1
机器人:=的versionName1.0><用途-SDK
安卓的minSdkVersion =8
机器人:targetSdkVersion =16/> <许可
机器人:名字=com.example.mapdemo.permission.MAPS_RECEIVE
安卓的ProtectionLevel =签名/><用途特征
机器人:glEsVersion =0x00020000
机器人:要求=真/><使用许可权的android:NAME =com.example.mapdemo.permission.MAPS_RECEIVE/>
<使用许可权的android:NAME =android.permission.INTERNET对/>
<使用许可权的android:NAME =android.permission.WRITE_EXTERNAL_STORAGE/>
<使用许可权的android:NAME =com.google.android.providers.gsf.permission.READ_GSERVICES/>
<使用许可权的android:NAME =android.permission.ACCESS_COARSE_LOCATION/>
<使用许可权的android:NAME =android.permission.ACCESS_FINE_LOCATION/><应用
机器人:allowBackup =真
机器人:图标=@绘制/ ic_launcher
机器人:标签=@字符串/ APP_NAME
机器人:主题=@风格/ AppTheme> <使用库机器人:名字=com.google.android.maps/> <活动
机器人:名字=com.abc.xyz.MapViews
机器人:标签=@字符串/ APP_NAME>
&所述;意图滤光器>
<作用机器人:名字=android.intent.action.MAIN/> <类机器人:名字=android.intent.category.LAUNCHER/>
&所述; /意图滤光器>
< /活性GT; &所述;元数据
机器人:名字=com.google.android.maps.v2.API_KEY
机器人:值=去掉/>< /用途>< /清单>
这是我的java文件:
公共类MapViews延伸活动{ @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.map_views);
}
}
这是我map_views.xml文件:
<?XML版本=1.0编码=UTF-8&GT?;
<片段的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:ID =@ + ID /图
机器人:名字=com.google.android.gms.maps.SupportMapFragment
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =match_parent/>
添加,我发现了错误:
了java.lang.RuntimeException:无法启动活动\\
ComponentInfo {} com.abc.xyz/com.abc.xyz.MapViews:\\
android.view.InflateException:二进制XML文件行#2:\\
错误充气类片段
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
在android.app.ActivityThread.access $ 2300(ActivityThread.java:125)
在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:2033)
在android.os.Handler.dispatchMessage(Handler.java:99)
在android.os.Looper.loop(Looper.java:123)
在android.app.ActivityThread.main(ActivityThread.java:4627)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:521)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
在dalvik.system.NativeStart.main(本机方法)android.view.InflateException:引起二进制XML文件行#2:\\
错误充气类片段
在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576)
在android.view.LayoutInflater.inflate(LayoutInflater.java:385)
在android.view.LayoutInflater.inflate(LayoutInflater.java:320)
在android.view.LayoutInflater.inflate(LayoutInflater.java:276)
在com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
在android.app.Activity.setContentView(Activity.java:1647)
在com.abc.xyz.MapViews.onCreate(MapViews.java:12)
在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
... 11更多抛出java.lang.ClassNotFoundException:引起装载机\\ android.view.fragment
dalvik.system.PathClassLoader [/system/framework/com.google.android.maps.jar:\\
/data/app/com.abc.xyz-2.apk]
在dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
在java.lang.ClassLoader.loadClass(ClassLoader.java:573)
在java.lang.ClassLoader.loadClass(ClassLoader.java:532)
在android.view.LayoutInflater.createView(LayoutInflater.java:466)
在android.view.LayoutInflater.onCreateView(LayoutInflater.java:544)
在com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
... 19 more`
如果您正在使用旧设备上的片段(pre蜂窝),你应该始终从 FragmentActivity $扩展您的活动C $ C>。
所以,你的问题的解决方案:改变你的 MapViews
类来扩展 FragmentActivity
进口android.support.v4.app.FragmentActivity;公共类MapViews扩展FragmentActivity {
...
更多信息和完整的例子:
http://android-er.blogspot.co.uk/2012 /12/using-supportmapfragment.html
说明:
例外的是这里重要的是:抛出java.lang.ClassNotFoundException:android.view.fragment
这样做的原因是,在pre-蜂窝设备活动时尝试加载它找到的关键字的XML布局片段
,它无法理解所以它会尝试加载它作为一个简单的内置视图类( android.view.fragment
)。
如果您延长 FragmentActivity
中的setContentView方法被重写,因此它可以处理片段
关键字。
Sorry i am posting this question on. I have refered so many links. But still not able to solve the issue
- I have linked the google-play-services_lib service.
- Set the property to Google Inc.
- Get the API_KEY from google console.
This is my Manifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.abc.xyz"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<permission
android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<uses-library android:name="com.google.android.maps"/>
<activity
android:name="com.abc.xyz.MapViews"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="removed" />
</application>
</manifest>
This is my .java file:
public class MapViews extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_views);
}
}
And this is my map_views.xml file:
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="wrap_content"
android:layout_height="match_parent" />
Add I'm getting the error:
java.lang.RuntimeException: Unable to start activity \
ComponentInfo{com.abc.xyz/com.abc.xyz.MapViews}: \
android.view.InflateException: Binary XML file line #2: \
Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #2: \
Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576)
at android.view.LayoutInflater.inflate(LayoutInflater.java:385)
at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
at android.app.Activity.setContentView(Activity.java:1647)
at com.abc.xyz.MapViews.onCreate(MapViews.java:12)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
... 11 more
Caused by: java.lang.ClassNotFoundException: android.view.fragment in loader \
dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:\
/data/app/com.abc.xyz-2.apk]
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
at android.view.LayoutInflater.createView(LayoutInflater.java:466)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:544)
at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
... 19 more`
If you're using fragments on older devices (pre Honeycomb) you should always extend your Activity from FragmentActivity
.
So, solution for your problem: change your MapViews
class to extend FragmentActivity
.
import android.support.v4.app.FragmentActivity;
public class MapViews extends FragmentActivity {
...
More info and a complete example: http://android-er.blogspot.co.uk/2012/12/using-supportmapfragment.html
Explanation:
The exception what is important here is: java.lang.ClassNotFoundException: android.view.fragment
.
The reason for this is that on pre-Honeycomb devices when the Activity tries to load the xml layout it finds the keyword fragment
which it can't understand so it tries to load it as a simple built-in view class (android.view.fragment
).
If you extend FragmentActivity
the setContentView method is overridden so it can process the fragment
keyword.
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